Twitter‘s co-founder, Jack Dorsey, has a lot on his plate these days. In addition to returning to Twitter as its CEO, Dorsey also remains CEO of his mobile payment company Square.

Square simplifies the traditional methods retailers typically use to process credit card transactions and makes such transactions easily available for any individual with an Android smartphone or iPhone. Rather than paying monthly fees or signing contracts, Square charges a simple 2.75% per transaction. Square works through a free downloadable application and a small device to read credit cards which plugs into a smartphone’s audio jack.

Last month, Square came under attack from VeriFone, a company that offers businesses traditional credit card terminals. VeriFone accused Square of offering a free credit card reader which could easily be used by hackers to steal credit card information. The problem VeriFone pointed to was the fact that the reader was incapable of encrypting the customer’s information. Square responded by pointing out that the vulnerability was no different than someone simply writing down your credit card information on a piece of paper. Yet, even with that bit of bad press courtesy of VeriFone, Dorsey’s company got a huge boost recently thanks to a new partnership with Apple.

Apple is now offering Square’s credit card reader through its online and brick-and-mortar stores. Customers will pay $9.95 for the credit card reader which includes $10 of Square credit. While the credit card reader is available for free through Square’s website, the immediate availability of it through Apple retail stores and the notable placement of the reader on Apple’s online store is sure to spur adoption. Apple’s endorsement of Square also minimizes the security concerns VeriFone attempted to raise last month in its attempt to derail adoption of the service since it greatly threatens VeriFone’s current business model.